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    ______ we admit that there are some problems with the new system, we believe they can be solved.

    A. Until B. While

    C. As D. Unless

     

    B

    【解析】

    试题分析：句意：虽然我们承认新的系统存在着一些问题，但是我们相信他们是可以解决的。A. Until直到……才；B. While 虽然；C. As随着、因为；D. Unless除非。故选B。

    考点：考查连词。

     

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